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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]      
Less unamortized debt issuance costs and debt discount $ (8,165) $ (3,164)  
Long-term debt, net—other than bank 2,384,980 2,321,937  
Aggregate principal payments, fiscal year maturity:      
2023 172,000    
2024 13,000    
2025 109,000    
2026 136,000    
2027 112,000    
Hawaiian Electric (parent only)      
Condensed Financial Statements, Captions [Line Items]      
Less unamortized debt issuance costs and debt discount (2,126) (1,520)  
Long-term debt, net—other than bank 557,874 548,480  
Aggregate principal payments, fiscal year maturity:      
2023 50,000    
2024 0    
2025 50,000    
2026 0    
2027 0    
Thereafter 460,000    
Cash dividends paid 168,000 172,000 $ 145,000
Hawaiian Electric (parent only) | ASB Hawaii, Inc. | Consolidated subsidiary      
Aggregate principal payments, fiscal year maturity:      
Accounts receivable reduction 1,900 2,100 2,300
HEI notes payable increase to ASHI 1,900 2,100 $ 2,300
Hawaiian Electric (parent only) | HEI 2.99% term loan, paid in 2022      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 0 150,000  
Debt instrument, stated interest rate 2.99%    
Hawaiian Electric (parent only) | HEI 3.99% senior notes, due 2023      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 50,000 50,000  
Debt instrument, stated interest rate 3.99%    
Hawaiian Electric (parent only) | HEI 4.58% senior notes, due 2025      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 50,000 50,000  
Debt instrument, stated interest rate 4.58%    
Hawaiian Electric (parent only) | HEI 4.72% senior notes, due 2028      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 100,000 100,000  
Debt instrument, stated interest rate 4.72%    
Hawaiian Electric (parent only) | HEI 2.82% senior notes, due 2028      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 24,000 24,000  
Debt instrument, stated interest rate 2.82%    
Hawaiian Electric (parent only) | HEI 2.48% senior notes, due 2028      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 30,000 30,000  
Debt instrument, stated interest rate 2.48%    
Hawaiian Electric (parent only) | HEI 2.98% senior notes, due 2030      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 50,000 50,000  
Debt instrument, stated interest rate 2.98%    
Hawaiian Electric (parent only) | HEI 3.15% senior notes, due 2031      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 51,000 51,000  
Debt instrument, stated interest rate 3.15%    
Hawaiian Electric (parent only) | HEI 2.78% senior notes, due 2031      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 25,000 25,000  
Debt instrument, stated interest rate 2.78%    
Hawaiian Electric (parent only) | HEI 2.98% senior notes, due 2032      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 30,000 0  
Debt instrument, stated interest rate 2.98%    
Hawaiian Electric (parent only) | HEI 5.43% senior notes, due 2032      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 75,000 0  
Debt instrument, stated interest rate 5.43%    
Hawaiian Electric (parent only) | HEI 5.43% senior notes, due 2034      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 35,000 0  
Debt instrument, stated interest rate 5.43%    
Hawaiian Electric (parent only) | HEI 3.74% senior notes, due 2051      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 20,000 20,000  
Debt instrument, stated interest rate 3.74%    
Hawaiian Electric (parent only) | HEI 3.94% senior notes, due 2052      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 20,000 $ 0  
Debt instrument, stated interest rate 3.94%